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token bus sublayer protocol send for some time then pass token if no data after that pass token right away traffic classes 0 2 4 and 6 highest
token bus physical order of stations doesnt matter line is broadcast medium send token by addressing neighbour provisions for deleting adding
gigabit ethernet data rate of 1000 mbps or else 1 gbps typically implemented as full-duplex with no csmacd 1000base-x utilizes long-wave optical
100base-fx utilizes two identical optical fibers in star topology one fiber holds frames from the station to hub one from hub to station encoding
fast ethernet operates at 100 mbps faster speeds required for image processing cad real-time audio and video no change in frame addressing format or
thinnet characteristics shorter range 185 meters as well as smaller capacity bus topology lan connectors and cables include thin coaxial cable nics
10base2 - thinnet cable diameter is about 064 cm rg-58 more flexible as well as easier to handle and install than thicknet 2 represents a maximum
10base5 connectors transceiver - intermediary device as well called a medium attachment unit mau performs csmacd function may perhaps contain small
thicknet characteristics it supports transmission rates up to 10 mbps in baseband mode less expensive in comparison of fiber-optic cable however
categories of traditional etherneta baseband - digital signals using manchester encodingb 10base2 10-base-t 10base5 10base-flc first number
ethernet frame fields preamble - seven bytes of alternating 0s also 1s to notify receiver of incoming frame and to provide synchronization sfd start
definition of csmacd csmacd carrier sense multiple access with collision detection is used to minimize collisions coordinate traffic and maximize
normal 0 false false false en-in x-none x-none microsoftinternetexplorer4 what is overlapping signalsoverlapping
what is a jam signal a jam signal is broadcasts to network by the transmitting stations that detected the collision to ensure that all stations know
csmacd - a simple definition a network station wishing to broadcast will first check the cable plant to make sure that no other station is
ieee 8023-ethernet introduction lan local area network - network connecting devices in a limited geographic area usually privately owned and limited
types of redundancy checks parity check simple parity check two dimensional parity check longitudinal redundancy check lrc crc cyclic redundancy
q error detection-redundancy in its place of repeating the entire data stream a shorter group of bits may be appended to the end of each unit called
q error detection-general sender transmits every data unit twice receiver performs bit-by-bit comparison between those two versions of data any
q what is an errorat any time bits flow from one point to another they are subject to unpredictable changes because of interferencethe interference
q explain about error detectiondata can be corrupted during transmission because of accidents storms sudden increase in electricity and voltage
q explain about flow control- signifies to ask the transmitter to stopresume sending in data- required when dte to dce speed gt dce to dce speed -
q show the function of signals- td transmitted data- rd received data- dsr data set ready indicate whether dce is powered on - dtr signifies data
q mechanical characteristics of rs232 interface- 9-pin connector- 9-pin connector is more usually found in ibm-pc but it covers signals for
q define rs232 interface- indicates the interface between dte and dce v28 mechanical as well as electrical characteristics v24 functional as well as